The best replacement for suricata is snort.

The best alternatives to suricata are rated as following:
★★★★★  snort
★★★  bro
★★★  ossec
  falcor

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Speaking about suricata, one probably shouldn't forget about snorby.

Other search terms related to suricata and their ratings are:
★★★★★ snorby
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suricata
snort
bro